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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9536175f13a81336c4f80c79937587d39a4d31d9b1d19a0b909f77c2d119d70' 
  AND token = 'yJLpEcO1jO2hsd7nHnjDbRx1QPeTHCdkEEdLScCgm9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}